Tutorial by Examples: d

Initialize the UITextField with a CGRect as a frame: Swift let textfield = UITextField(frame: CGRect(x: 0, y: 0, width: 200, height: 21)) Objective-C UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 200, 21)]; You can also create a UITextField in Interface Builde...

Given below is a simple example to train a Caffe model on the Iris data set in Python, using PyCaffe. It also gives the predicted outputs given some user-defined inputs. iris_tuto.py import subprocess import platform import copy from sklearn.datasets import load_iris import sklearn.metrics ...

As your activity begins to stop, the system calls onSaveInstanceState() so your activity can save state information with a collection of key-value pairs. The default implementation of this method automatically saves information about the state of the activity's view hierarchy, such as the text in an...

Fragments also have a onSaveInstanceState() method which is called when their state needs to be saved: public class MySimpleFragment extends Fragment { private int someStateValue; private final String SOME_VALUE_KEY = "someValueToSave"; // Fires when a configuration ch...

Demonstrate how to embed a lua interpreter in C code, expose a C-defined function to Lua script, evaluate a Lua script, call a C-defined function from Lua, and call a Lua-defined function from C (the host). In this example, we want the mood to be set by a Lua script. Here is mood.lua: -- Get versi...

To setup a WebRTC-based communication system, you need three main components: A WebRTC signaling server To establish a WebRTC connections, peers need to contact a signaling server, which then provides the address information the peers require to set up a peer-to-peer connection. Signaling serv...

Suppose you have multiple threads running. Each thread is doing one task. You want to get notified either on the mainThread OR another thread, when all the task-threads are completed. The simplest solution to such a problem is a DispatchGroup. When using a DispatchGroup, for each request, you ente...

Validation attributes can be used to easily configure model validation. public class MyModel { public int id { get; set; } //sets the FirstName to be required, and no longer than 100 characters [Required] [StringLength(100)] public string FirstName { get; set; } } Th...

You can create your own queue using dispatch_queue_create Objective-C dispatch_queue_t queue = dispatch_queue_create("com.example.myqueue", DISPATCH_QUEUE_SERIAL); Swift // Before Swift 3 let queue = dispatch_queue_create("com.example.myqueue", DISPATCH_QUEUE_SERIAL) // ...

You can add an image to a view's layer simply by using its contents property: myView.layer.contents = UIImage(named: "star")?.CGImage Note that the UIImage needs to be converted to a CGImage. If you wish to add the image in its own layer, you can do it like this: let myLayer = CA...

Basics There are a number of different transforms you can do on a layer, but the basic ones are translate (move) scale rotate To do transforms on a CALayer, you set the layer's transform property to a CATransform3D type. For example, to translate a layer, you would do something like this:...

CALayer property animations are enabled by default. When this is undesirable, they can be disabled as follows. Swift CATransaction.begin() CATransaction.setDisableActions(true) // change layer properties that you don't want to animate CATransaction.commit() Objective-C [CATransaction be...

Xposed is a framework that allows you to hook method calls of other apps. When you do a modification by decompiling an APK, you can insert/change commands directly wherever you want. However, you will need to recompile/sign the APK afterwards and you can only distribute the whole package. With Xpose...

Create a new class implementing IXposedHookLoadPackage and implement the handleLoadPackage method: public class MultiPatcher implements IXposedHookLoadPackage { @Override public void handleLoadPackage(XC_LoadPackage.LoadPackageParam loadPackageParam) throws Throwable { ...

Making an app adaptive – that is, responding to size class changes by changing your layout – often involves lots of help from the Auto Layout system. One of the primary ways apps become adaptive is by updating the active Auto Layout constraints when a view's size class changes. For example, conside...

A key piece of adaptivity in a modern iOS app is supporting multitasking on iPad. By default, apps created in Xcode 7 and newer will be configured to support multitasking: they'll have a LaunchScreen.storyboard file that uses Auto Layout. The easiest way for existing apps to opt in to multitasking ...

void alertDialogDemo() { // get alert_dialog.xml view LayoutInflater li = LayoutInflater.from(getApplicationContext()); View promptsView = li.inflate(R.layout.alert_dialog, null); AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder( ...

Considering a (post)model: public class User { public string FirstName { get; set; } public bool IsAdmin { get; set; } } With a view like so: @using (Html.BeginForm()) { @Html.EditorFor(model => model.FirstName) <input type="submit" value="Save" /...

Sometimes the shell prompt doesn't display the name of the virtual environment and you want to be sure if you are in a virtual environment or not. Run the python interpreter and try: import sys sys.prefix sys.real_prefix Outside a virtual, environment sys.prefix will point to the system p...

There are some functions to help tear down Free computations by interpreting them into another monad m: iterM :: (Functor f, Monad m) => (f (m a) -> m a) -> (Free f a -> m a) and foldFree :: Monad m => (forall x. f x -> m x) -> (Free f a -> m a). What are they doing? First l...